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Cold Water Backfeeding?

11-10-2009, 08:09 AM

Last weekend I was working on my hotwater tank and when I finished and was getting ready to refill the system I noticed the following. I had the supply vavle off to the tank and when I turn the house supply on there was water coming back into the tank from the hot line. I had faucets opened around the house so I had my wife close them all. I thought maybe it the water was "crossing over" into the hot and going back to the tank. But after all the faucets were closed it was still happening.
My only thoughts are can it backfeed through a washing machine? Also I have a tempering valve at the hotwater tank which I just installed.
Advice would be great!!

Comment

The tempering valve is being used because I have a coil in my coal furnace and I want to have some control on the water temp. I do not have any Moen units. I do have a Kohler unit in the shower. This is a 2 handle unit one is for water volume and the other is for water temp.

Comment

Last weekend I was working on my hotwater tank and when I finished and was getting ready to refill the system I noticed the following. I had the supply vavle off to the tank and when I turn the house supply on there was water coming back into the tank from the hot line. I had faucets opened around the house so I had my wife close them all. I thought maybe it the water was "crossing over" into the hot and going back to the tank. But after all the faucets were closed it was still happening.
My only thoughts are can it backfeed through a washing machine? Also I have a tempering valve at the hotwater tank which I just installed.
Advice would be great!!